| Message ID | 1548917996-28081-11-git-send-email-ramalingam.c@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/i915: Implement HDCP2.2 | expand |
>-----Original Message----- >From: C, Ramalingam >Sent: Thursday, January 31, 2019 12:29 PM >To: intel-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; >daniel.vetter@ffwll.ch; Winkler, Tomas <tomas.winkler@intel.com>; Shankar, >Uma <uma.shankar@intel.com> >Cc: C, Ramalingam <ramalingam.c@intel.com> >Subject: [PATCH v10 10/40] drm: helper functions for hdcp2 seq_num to from u32 > >Library functions for endianness are aligned for 16/32/64 bits. >But hdcp sequence numbers are 24bits(big endian). >So for their conversion to and from u32 helper functions are developed. > >v2: > Comment is updated. [Daniel] > >Signed-off-by: Ramalingam C <ramalingam.c@intel.com> >Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Looks ok to me. Reviewed-by: Uma Shankar <uma.shankar@intel.com> >--- > include/drm/drm_hdcp.h | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) > >diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index >d6dfef8cff6a..7260b31af276 100644 >--- a/include/drm/drm_hdcp.h >+++ b/include/drm/drm_hdcp.h >@@ -252,4 +252,22 @@ struct hdcp2_dp_errata_stream_type { > #define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2)) > #define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3)) > >+/* >+ * Helper functions to convert 24bit big endian hdcp sequence number to >+ * host format and back >+ */ >+static inline >+u32 drm_hdcp2_seq_num_to_u32(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN]) { >+ return (u32)(seq_num[2] | seq_num[1] << 8 | seq_num[0] << 16); } >+ >+static inline >+void drm_hdcp2_u32_to_seq_num(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN], >u32 >+val) { >+ seq_num[0] = val >> 16; >+ seq_num[1] = val >> 8; >+ seq_num[2] = val; >+} >+ > #endif >-- >2.7.4
diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index d6dfef8cff6a..7260b31af276 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -252,4 +252,22 @@ struct hdcp2_dp_errata_stream_type { #define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2)) #define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3)) +/* + * Helper functions to convert 24bit big endian hdcp sequence number to + * host format and back + */ +static inline +u32 drm_hdcp2_seq_num_to_u32(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN]) +{ + return (u32)(seq_num[2] | seq_num[1] << 8 | seq_num[0] << 16); +} + +static inline +void drm_hdcp2_u32_to_seq_num(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN], u32 val) +{ + seq_num[0] = val >> 16; + seq_num[1] = val >> 8; + seq_num[2] = val; +} + #endif